Car-brake.



No. 690,769. Patented Ian; 7,1902;

S.'H. POCOCK.

OAR BRAKE.

(Applicnfion filed May 25,v 1901.) (No Model.) 2 Sheets-Shaot l.

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.Nd. 699,769. Patented la'n. 7,1902.

s. H. vococxf CAB BRAKE."

Application fi led m 25, 1901. (No Model.) 2 Sheets-Sh n! 2.

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UNITED STATES PATENT OFFICE.

STEPHEN HARRY POCOCK, OF HAMILTON, CANADA.

CAR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 690,769, dated January'7, 1 902. Application filed May 25, 1901. $erial No. 61,835. (Nomodel.)

To all whom it may concern:

Be it known that I, STEPHEN HARRY Po- COOK, a citizen of (Janada,residing at Hamilton, in the county of Wentworth and Province ofOntario, Canada, have invented certain new and useful Improvements inCar- Brakes; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

My invention relates to improvements in railroad and street carwheel-brakes, in which a brake is arranged and devised in such a mannerthat the same may be applied to one or more pairs of wheels of a car andoperated to stop or to partially stopthe wheels in a most direct andeflicient manner. 4

The objects of my invention are, first, to gradually stop a car or atrain of cars in a most satisfactory manner, and, second, to fully stopthe cars in a very short period of time in case of emergency without anydetriment to the wheels. I attain these objects by the mechanismillustrated in the accompanying drawings, in which- Figure 1 is a sideelevation of the invention as applied to a car, the brakes beingdisengaged and in normal position. Fig. 2 is a longitudinal sideelevation of Fig. 1 as viewed from the position of the broken verticalline A A in Fig. 3 of the drawings. In this view, Fig. 2, the teeth onthe horizontal plane of the slidable brake-shoe arenot shown in orderthat the view may be less complex relative to the spiral wheels, asshown. Fig. 3 is an end elevation of Fig. 1 of the drawings and partlyin section as viewed from the rear or righthand end of the car andthrough the broken line B B of Fig. 1 of the drawings. Fig. 4 is an endelevation in section through the broken vertical line GO-of Fig. 1 ofthe drawings as viewed from the rear end of the car. Fig. 5 is a sideelevation of the friction brakeblock with shoe, showing the lowerposition of said brake and shoe as engaged with the face of a car-wheeland the rail, the car-wheel being slightly raised from the rail, alsothe .same device when raised to its higher position, this higherposition of the brake and shoe being shown in broken lines. Fig. 6 is aside elevation of one of the detached ectric spur-wheels shown gearedinto the spurrack of the slidable shoe. In the drawings the floor orframework of the car is indicated by D, the car-wheels by E, thetransverse revolving axles by F, the axle-bearings by H, and the railsby J. The bearings H are secured to the under side of the floor or frameD of the car. These bearings H are provided with front stationary arms2, which act as bearings for the transverse shaft K. The said front arms2 supportthe transverse shaft K. It will be readily understood thatbearings for the trans verse shaft could be secured to the car-frame andbe sufficiently strong and steady to serve the purpose set forth.

The car is provided with a longitudinal operating-shaft M, which iscapable of revolving in stationary bearings N, which are secured to theunder side of the frame D of the of the car is a manipulating wheel orhandle S, which is secured on the vertical shaft T, (shown broken,)thatthe same may be extended to a convenient height. The shaftT iscapable of revolving in the stationary bushing U in the floor of the carand has a collar 3to rest on said'bushing. The lower end of the shaft Thas a bevel gear-wheel V secured thereto. Said gear-wheel gears into thebevel gear-wheel W, which is secured on the longitudinal shaft M torevolve the same.

The ends of the transverse shaft K are provided with eccentrics Y, whichare secured to the shaft. These eccentrics are capable of a revolvingmotion in the friction brake-blocks Z. The usual side flanges of theeccentrics Y retain. said friction brake-blocks in position on saideccentrics. These friction brakewheels E and have a large and extendedfriction-surface brought to bear against the said face of thecar-wheels. It will be noticed that in Figs. 1 and 2 of the drawings theflanges of the car-wheels E have a portion broken away. The object ofthis is to show the face of the wheels E more clearly and the relativeposition of the brake-wheelsZ to the face of said car-wheels.

The lower parts of the friction brake-blocks are provided with slidablebrake-shoes 6, with end lips '7 and horizontal dovetail tongues S, whichare capable of sliding in the horizontal grooves 9 in the lower part ofthe brakes Z. These grooves 9 conform to the dovetail tongues 8 in shapeto prevent the slidable brakes 6 from leaving their proper position onthe brakes Z. The inner parts of the slidable brakes 6 have horizontalprojections 10, which have spur rack-teeth 12. The transverse shaft K isprovided with eccentric spurwheels 13, secured on the shaft K ineccentric form, that when the eccentrics Y perform their function inbringing the brake-blocks Z against the car-wheels E the teeth of thespurwheels 13 and the teeth 12 of the slidable brakes 6 shall beengaged. The spur-wheels 13 are positioned out of center on the shaft Kand are positioned similar to the eccentrics Y and operate with the saideccentrics, and when the eccentrics bring the brake-blocks Z toward therails J and at the same time toward the car-wheels E the brake-shoes areforced toward the face of the wheels E. The way the car runs isindicated by arrows, and the way the operating parts of the mechanismrevolve to bring the brake-blocks to the carwheels in the mannerdescribed is also indicated by arrows.

The upper and forward parts of the brakeblocks Z are provided with lugs16, and the lugs 17 are secured to the under side of the car-floor Dabove said brake-blocks. An arm 18 is pivoted to the lugs 16, and an arm19 is pivoted to the lugs 17,and the other ends of the two said arms 18and 19 are pivoted together to form a pivotal elbow to allow thebrakeblocks to rise and to descend to engage the car-wheels E. Thesepivotal elbow-arms 18 and 19 as connected are also for the purpose ofpreventing the brake-blocks Z from leaving their proper and desiredposition on the eccentrics Y.

It will be noticed that the ends of the 1ongitudinal shaft M are brokento indicate that the shaft may be extended to other cars fora similarpurpose, also that the brake-blocks Z may be limited to apply to onepair of carwheels or the same system may apply to more pairs ofcar-wheels and cars.

The operation of applying the brake-blocks to a pairor to pairs ofcar-Wheels is as follows: By the manipulation of the wheel S thevertical shaft T is revolved and also the bevelgear V on the lower endof said shaft T. The wheel V revolves, as indicated by arrow, andrevolves the gear-wheel W, with its longitudinal shaft M, as indicatedby arrow on said wheel W. Consequently the spiral gear-wheel P revolvesthe same way as the wheel W. The spiral wheel P gears into and revolvesthe spiral gear-wheel R on the transverse shaft K the way as indicatedby arrows. At this time the eccentrics Y on the ends of said transverseshaf tK bring the connected brakeblocks Z into friction engagement withthe running-face of the car-wheels E, and thus the brakes are applied.The lower brakeshoes 6 are operated by the eccentric spurwheel 13 ontransverse shaft K when said shaft is revolved, as described. Theeccentric wheels 13 revolve with the eccentrics Y. Consequently theeccentric wheels 13, which are geared into the teeth 12 of the shoes 0,bring the shoes into engagement with the lower front or face part of thecar-Wheels E. This engagement of the shoes 6 with the carwheels E isvery important, especially so in case of emergency. Then greater powermay be applied to the operating mechanism and the car-wheels E operatedupon will mount the engaging end of the shoes 6 and the said shoes willslide upon the rails J until the car or cars stop. This stopping of thecars is accomplished in a very short space of time and Without any unduewear in one particular place on the face of the car-wheels, thusavoiding the grinding of flat spots on the face of the car -wheels. Whenthe manipulatingwheel S is reversely revolved, the eccentrics Y and theintermediate mechanism connecting said wheel S and said eccentrics Yalso reversely revolve. Consequently the eccen tries Y bring thebrakeblocks Z upward and to the face of the car-wheels E to about thecenter of the wheels E. This reversed operation of applying the brakesis also satisfactory in stopping the cars and may be applied on ordinaryoccasions. This reverse movement of the operating mechanism slides theshoes 6 away from contact with the carwheels E by the reverse revolvingof the cocentric wheels 13,caused by said reverse movement of the wheel5.

The arms 18 and 19, previously referred to, are pivotally connected toeach other and to the car and the brake-blocks in such a manner as toallow the brake-blocks to perform their proper functions and at the sametime preventing the lower engaging part of the brakeblocks from tippingonto the rails J.

Various changes in the form, proportion,- and minor details of thisinvention may be resorted to without departing from the spirit and scopethereof. Hence What I claim as my invention, and desire to secure byLetters Patent, is-- 1. In a car-brake, a frame, a longitudinal shaft,bearings secured to said frame to support said shaft, a transverseshaft, hearings to support said transverse shaft, a spiral gear: wheelon the transverse shaft, a spiral gear wheel on the longitudinal shaft,to revolve the transverse shaft, friction brake-blocks,

, shaft to propel the brakes and the shoes, rails,

substantially as described and set forth.

3. In a car-brake, a frame, a longitudinal shaft, bearings secured tothe frame for said shaft, a spiral gear-wheel secured on said shaft, atransverse shaft, bearings to support the transverse shaft, a spiralgear-wheel on the transverse shaft to gear into the spiral gear on thelongitudinal shaft, friction brakeblocks, eccentrics on the transverseshaft, said eccentrics capable of revolving in said brakes, pivotal armspivotally connected to the upper part of the brakes and to the frame,andmeans to revolve the longitudinal shaft, substantially as describedand set forth.

4. In a car-brake, a frame, a transverse shaft, bearings to support saidshaft, brakeblocks, eccentrics on said shaft to revolve in said brakes,slidable shoes on the lower part of the brakes, rack-teeth on the innersides of said shoes, eccentric gear-wheels on said shaft to gear intosaid rack-teeth, pivotal elbow-arms, said arms. pivotally connected tothe upper part of said brakes and to the frame, and means to revolvesaid transverse shaft to engagethe brakes, and the shoes, substantiallyas described and set forth.

5. In a car-brake, a transverse shaft, bearings secured to the car forsaid shaft, eccentrics secured on the ends of the shaft, brakeblocks onsaid eccentrics, slidable shoes on the lower part of the brake-blocks,teeth on the inner side of the shoes, eccentric gearwheels on said shaftto gear into the teeth of the shoes, and means for revolving said shaft,substantially as described and set forth.

In testimony whereof I affix my signature in presence of two witnesses.

STEPHEN HARRY POCOOK.

